The OEIS Foundation is grateful to everyone who made a donation during our Annual Appeal. Visit the new and spectacular Pictures from the OEIS page!
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index entries for primes by primitive root
pr=21; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A042247 A041451 A130112 * A155025 A191068 A069690
Adjacent sequences: A019345 A019346 A019347 * A019349 A019350 A019351
David W. Wilson